مقالة المستوى الرابع

today's article is mostly physics.
the movement of any body or object(particels and molecules) will produce heat as result of changing the energy from one form to another for example when the light is on, it temperature increase because the electricity has been transformed into heat(light).
when we run(or any activity that contain movement) our temperature increase because the organs (bones and muscles )in our body will be transformed into heat and the same principle for all Machines like the car ,Engine so the first law is:
energy can not be created or destroyed it only changes form.
let's take another example: if we push the ball upward(vertical) to the space by giving it some force with our hand it will start falling downward because gravity force will pull the ball downward to the earth surface.
when two force are opposite to each other (one on the left and the other are on the right ,one is upward and the other is downward) the resultant force will be on the direction of the stronger force.
in our example the gravity was stronger than our force so the ball fall down.
you know that matters is any thing that take space and it has three states: solid, liquid and gas but let's explain a little more.
solid has regular(definite) shape and regular(definite) volume.
liquid has irregular(indefinite) shape but regular(definite) volume.
gas has irregular(indefinite)shape and irregular(indefinite) volume .